Means for cooling pistons and piston-rods of gas or other motors.



No. 675,886. Patented lune ll, l90l. H. E. EBBS. MEANS FOR COOLINGPISTONS AND PISTON RODS OF GAS OR OTHER MOTORS.

(Application filed Dec. 20, 1899.)

(No llodel.)

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UNITED STATES PATENT OFFICE.

I'IERMANN EDGAR EBBS, OF NUREMBERG, GERMANY, ASSIGNOR TO THE FIRM OFVEREINIGTE MASOIIINENFABRIK AUGSBURG UND MASCHIN- PLACE.

MEANS FOR COOLING PISTONS AND PISTON-RODS F GAS OR OTHER MOTORS.

SPECIFICATION forming part of Letters Patent No. 675,886, dated June 11,1901.

To all whom it may concern:

Beitknown that LIIERMANN EDGAR Ennsa subject of the Queen of GreatBritain, residingat Nuremberg, Bavaria, German Empire,

have invented a certain new and Improved Means For Cooling the Pistonsand Piston- Rods of Gas or other Motors, of which the following is adescription.

The presentinvention consists of means for IO cooling the pistons andpiston-rods of gas and other motors, as hereinafter particularly setforth, and pointed out in the claims.

In order to render the present specification easily intelligible,reference is had to the ac- |5 companying sheet of drawings, in which myinvention is represented and in which similar letters of referencedenote similar parts throughout the several views.

Figure 1 is a sectional elevation of two pistons and their connectingpiston-rod as arranged for atandem motor. Fig. 2 is a partsectionalelevation showing the means for feeding the cooling-water to and drawingit off from the piston-rod, and Fig. 3 is a similar section showing amodified structure for the same purpose.

The difficulty which has hitherto been experienced in constructing twingas and petroleum motors as tandem engines was to be 0 found in thegreat heat to which the piston rod was subjected in the front cylinder,which increased the friction in the glands and caused the same to becomeloose, in tinencing the stuffing-boxes generally in a verydisadvantageous manner. These disadvantages are obviated in the presentinvention by providing efficient cooling means for the piston-rods andthe pistons. In order to attain this end, the piston-rod a is provided 0with aboring 1) throughout its length, within which a pipe is arranged,as at c, to form an interior cylindrical passage and an outer annularpassage (1. At a suitable point at or near the middle of the piston-rodaninletopeningf to the annular space/(Z is provided, and at the oppositeside of the said rod an outlet-opening g, leading direct to the innertube 0, is also arranged. Both of these openings communicate withflexible tubes h and Application filed December 20, 1899. Serial No.740,965. (No model.)

'23, by means of which water is fed to and withdrawn from the saidspaces. There are various ways of arranging the circulation of the waterin the piston-rod and through the hollow pistons, two being shown in thepresent drawings. The water may enter the annular space (I by tube It atf (see Fig. 2) and pass along the hollow rod in both directions 2 (2.,toward both pistons 7c 7;-the water passing out of a laterally-arrangedopening Z (lower end of Fig. 1) into the hollow interior chamber m ofthe piston. Here it enters a space consisting of a series of concentricchambers formed by concentric ribs 12 on the piston-head, projectingbetween intervening concentric ribs 19, formed on the removable cover 0,and is gradually conducted to the outer parts of the hollow piston. Theribs 11. on the piston-head are concentric and are so spaced as to enterthe channels formed between the concentric ribs p, formed on thespindle-plate or removable cover 0. By this means there is formed aseries of concentric channels across which the cooling fluid flows fromthe center to the edge of the pistonheads, where it passes into apassage 7" in each piston-head, which passages conduct it into thecenter tube (2, whence it passes out of the structure by passage 9. Thepiston heads and rods will thereby be efficiently cooled.

At the upper end of Fig. 1 a somewhat different arrangement is shownfrom the arrangement shown at the lower end, the water entering theannular chamber (1, passing into the central chamber m, thence along thespaces between the ribs n and 19 toward the periphery of the piston, andfrom the outermost part of the latter along the canal r direct to theinner tube c and back to the outlet 9 1?. In both these cases the inletand outlet for the water are arranged as shown at Fig. 2. If thearrangement is made as illustrated in Fig. 3, the two devices shown inconnection with Fig. 1 may be combined and the water caused to flowfirst to one piston and then back to the other and then out at g. Inthis case the piston-rod a is provided with an annular partition 4',which separates the annular space into two chambers d and 1/, dividingthe water-inlet from the outlet. In this construction the water enteringatf flows along the annular chamber 21, through l into thepiston-chamber m, between the ribs of the piston-chamber to theperiphery of the piston at the lower end of Fig. 1, through the canal rto the inner tube 0, throughout the whole length of this tube to thelcft-hand-end piston, out at the end of the tube through r to theperiphery of this piston, back through the piston-chamber in theopposite direction to that taken in the other piston into the chamberIn, and back into the annular chamber (Z, from which it runs off at g.

I claim as my invention-- 1. Apiston for combustion-engines comprising ahollow piston-rod. having a fluid-inlet and a fluid-outlet and apiston-head in liquid communication with the hollow piston-rod andchambered for the reception of cooling fluid, the said chamber beingformed by continuous ribs in two sets, one set of ribs intermeshing withthe other set of ribs so as to cause the fluid to flow in thepiston-head in a serpentine path.

2. A piston-head chambered for the reception of a cooling fluid andprovided with continuous intermeshing ribs and a piston-rod providedwith inlet and outlet apertures and in liquid-conducting communicationwith the chambered piston-head.

3. A piston for use in combustion-engines consisting of a plurality ofpiston-heads, a hollow piston-rod connecting the said pistonheads, eachof the said piston-heads being chambered, in liquid-conductingcommunication with the hollow piston-rod and providcd with intermeshingribs to cause the fluid to flow in the chambers of the heads in atortuous path.

4. A chambered piston-head comprising in its structure a series ofconcentric ribs extending longitudinally of the said pistonhead, asecond series of concentric ribs extending longitudinally of the saidpiston-head and intermeshing with the first set or series of concentricribs, the space between the said ribs being available for thecirculation of cooling fluid.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

HERMANN EDGAR EBIES. \Vitnesses:

ANDREAS STICII, ()soAR 1100K.

